电流中断法在线测定直接甲醇燃料电池的欧姆阻抗

作者：刘敏; 王金海; 王树博; 谢晓峰; 周涛; V K Mathur

来源：中国化学工程学报(英文版), 2010, 18(5): 843-847.

• direct methanol fuel cell(DMFC)
• ohmic resistance
• current interruption method
• electrochemical im-pedance spectroscopy(EIS)
• membrane resistance

Electrochemical impedance spectroscopy(EIS)is widely used in fuel cell impedance analysis.However,for ohmic resistance(RΩ),EIS has some disadvantages such as long test period and complex data analysis with equivalent circuits.Therefore,the current interruption method is explored to measure the value of RΩ in direct methanol fuel cells(DMFC)at different temperatures and current densities.It is found that RΩ decreases as tem-perature increase,and decreases initially and then increases as current density increases.These results are consistent with those measured by the EIS technique.In most cases,the ohmic resistances with current interruption(R1)are larger than those with EIS(REIS),but the difference is small,in the range from-0.848% to 5.337%.The errors of RiR at high current densities are less than those of REIS.Our results show that the RiR data are reliable and easy to obtain in the measurement of ohmic resistance in DMFC.

• 单位
  清华大学; University of New Hampshire; 中南大学